QCM-C-PDP Portable partial discharge monitor for cables ......measuring partial discharge in cables with confidence. Used for low-cost, high performance periodic online and offline

® ®©2013 QUALITROL Company LLC, an ISO 9001 system certified company. QUALITROL is a registered trademark and OTIWTI is a trademark of QUALITROL Company LLC. All trademarks are properties of their respective companies, as noted herein. All rights reserved. Information subject to change without notice. PD-D27-14L-02E.

Email: [email protected]

www.qualitrolcorp.com

®About QUALITROL®Established in 1945, with continual improvement at the core of our business, QUALITROL provides smart utility asset

condition monitoring across the globe. We are the largest and most trusted global leader for partial discharge monitoring, ®asset protection equipment and information products across generation, transmission and distribution. At QUALITROL

we are redefining condition monitoring technology for Electric utilities assets.

Online PD measurement at power cables without disrupting plants / facilities - offline factory testing

Excellent interference immunity for PD measurement under difficult conditions

Highest level of reliability of PD inspection

Highly accurate fault location and PD severity analysis

Power cables are not exposed to higher voltage stresses

PD measurement and analysis with total confidence

Unbiased diagnosis and assessment of critical power cables

Expert consulting services during acceptance testing and maintenance planning are available

Overall insulation health assessment and extension of life time of power cable

Implementation of efficient condition based maintenance strategies

Ensuring reliable continued operation ofpower cables and termination boxes ofmetal clad switchgear, rotating machinesand transformers

Portable partial discharge monitor for cables

QCM-C-PDPQCM-C-PDP Portable partial discharge monitor for cables

Product SummaryProduct SummaryDescription The portable system can be QCM-C-PDP

used to measure partial discharges in power cables

and terminations boxes of metal clad switchgear,

rotating machines and transformers. PD can be

localized within 0.2% to 1% of the cable length. The

QCM-C-PDP can be applied to measure PD on-line on

cables and their termination boxes while the system is

energized. There is no need to de-energize the cables

if some requirements are met.

Application The QCM-C-PDP cable online PD

measurement system can be successfully used for

measuring partial discharge in cables with confidence.

Used for low-cost, high performance periodic online

and offline PD testing on HV insulating system of

power cables and their terminations in transmission

installations, power plants and large industrial

consumers. The information gained may be used for

condition based maintenance decisions

Highly accurate periodic PD survey of HV/MV power cables eliminates risk of unplanned outages

Precise PD localization (within 0.2% to 1% of cable length) minimizes maintenance expenditure

Accurate categorization of different activities captured by system

Robust and rugged design to maximize portable operation life and support inspections / testing for extended period of time

Advanced denoising and filtering help to remove background noise efficiently


Failure in cable insulation is generally preceded by partial discharge and subsequent degradation phase

Detecting partial discharge at the early stage of degradation helps in preventing sudden failure

The QCM-C-PDP system makes sure that there is no PD in the installed power cables

HFCTs (High Frequency Current Transformers) used in the systems are sensitive to a wide range of frequency (200 kHz - 15 MHz)

TEV (Transient Earth Voltage) sensors to differentiate between PD and local discharge (Corona, surface discharge)

Advanced de-noising based on proven noise gating technology - Wavelet Filtering

Categorization of different activities captured during acquisition Prioritizing corrective actions or replacements can be decided based upon

analysis and reports

Highly accurate location algorithms based on “Time Domain Reflectometry” (TDR)

Higher acquisition rate and dynamic threshold selection improves definition on PD events

Transponder is used for longer cables to improve the accuracy of detecting PD location along the length of cable

More than 25 years of experience in PD analysis into HV apparatus

The most important stage before data analysis is the separation of different activities captured during acquisition

Expert analysis software successfully categorizes the different activities captured

Categories can then be easily marked as Cable PD, External PD, Noise or Interference

Localization of cable PD can be done easily by examining a few segments inside the category

IP66 rated highly protective case System integrated with filters and surge protection Online support by researchers and experts from Qualitrol DMS, Glasgow

HFCTs can be clamped on the energised cable earth TEVs can be attached magnetically to the metal clad switchgear (even when

the cables are operational) HFCTs are passive and do not have any impact on the electric field of cable Easy to connect with the data acquisition unit and analysis system


Accurate categorization of different activities captured by the system


Why partial discharge measurement in power cables? Failure in cable insulation is generally preceded by a degradation phase which may last for months or

several years Any insulation degradation results in the inception of partial discharges (PD) at degradation site(s) PD analysis and localisation helps in determining the insulation health and subsequently the life of power

cables

Why QUALITROL Expert diagnostic and testing services? More than 25 years of experience in providing PD monitoring systems and services to utilities across the

world World wide presence provides quick turn around times Long term serviceability assurance helps in formulating longer service contracts Cross team integration increases the accuracy of results and confidence of operator / asset manager Highly accurate PD detection and localisation system for power cables Greater emphasis on health and safety during PD measurements surveys

QCM-C-PDP Portable partial discharge monitor for cables

Online and non-intrusive PD measurement

System overviewSensors HFCT sensors detect the high frequency signals induced from any PD pulse inside the cable insulation and send to

data acquisition unit for further analysis. TEV sensors are used to detect the corona and surface discharge. It helps in differentiating PD activity inside the insulation from corona and surface discharge

Data Acquisition Unit The DAU takes the signal from sensors and applies filtering and noise gating to reject interference. The digitised high

frequency pulse is then sent to the Analysis System for further analysis

Analysis System The PD analysis system determines if the high frequency signal is a PD signal or not. It stores all PD signals with their

parameters for trend analysis. The PD analysis system also locates the fault along the cable with an accuracy of less than 0.2% to 1% of the total cable length

Transponder The Transponder is used for PD localization in cases of long cables > 3 km (1.8 miles). It injects the pulse back after

receiving the actual PD signal in order to make comparison simpler for the system

PD analysissystem (installedin Laptop)

Transponder

Accessories kit



Failure in cable insulation is generally preceded by partial discharge and subsequent degradation phase

Detecting partial discharge at the early stage of degradation helps in preventing sudden failure

The QCM-C-PDP system makes sure that there is no PD in the installed power cables

HFCTs (High Frequency Current Transformers) used in the systems are sensitive to a wide range of frequency (200 kHz - 15 MHz)

TEV (Transient Earth Voltage) sensors to differentiate between PD and local discharge (Corona, surface discharge)

Advanced de-noising based on proven noise gating technology - Wavelet Filtering

Categorization of different activities captured during acquisition Prioritizing corrective actions or replacements can be decided based upon

analysis and reports

Highly accurate location algorithms based on “Time Domain Reflectometry” (TDR)

Higher acquisition rate and dynamic threshold selection improves definition on PD events

Transponder is used for longer cables to improve the accuracy of detecting PD location along the length of cable

More than 25 years of experience in PD analysis into HV apparatus

The most important stage before data analysis is the separation of different activities captured during acquisition

Expert analysis software successfully categorizes the different activities captured

Categories can then be easily marked as Cable PD, External PD, Noise or Interference

Localization of cable PD can be done easily by examining a few segments inside the category

IP66 rated highly protective case System integrated with filters and surge protection Online support by researchers and experts from Qualitrol DMS, Glasgow

HFCTs can be clamped on the energised cable earth TEVs can be attached magnetically to the metal clad switchgear (even when

the cables are operational) HFCTs are passive and do not have any impact on the electric field of cable Easy to connect with the data acquisition unit and analysis system


Accurate categorization of different activities captured by the system


Why partial discharge measurement in power cables? Failure in cable insulation is generally preceded by a degradation phase which may last for months or

several years Any insulation degradation results in the inception of partial discharges (PD) at degradation site(s) PD analysis and localisation helps in determining the insulation health and subsequently the life of power

cables

Why QUALITROL Expert diagnostic and testing services? More than 25 years of experience in providing PD monitoring systems and services to utilities across the

world World wide presence provides quick turn around times Long term serviceability assurance helps in formulating longer service contracts Cross team integration increases the accuracy of results and confidence of operator / asset manager Highly accurate PD detection and localisation system for power cables Greater emphasis on health and safety during PD measurements surveys


Online and non-intrusive PD measurement

System overviewSensors HFCT sensors detect the high frequency signals induced from any PD pulse inside the cable insulation and send to

data acquisition unit for further analysis. TEV sensors are used to detect the corona and surface discharge. It helps in differentiating PD activity inside the insulation from corona and surface discharge

Data Acquisition Unit The DAU takes the signal from sensors and applies filtering and noise gating to reject interference. The digitised high

frequency pulse is then sent to the Analysis System for further analysis

Analysis System The PD analysis system determines if the high frequency signal is a PD signal or not. It stores all PD signals with their

parameters for trend analysis. The PD analysis system also locates the fault along the cable with an accuracy of less than 0.2% to 1% of the total cable length

Transponder The Transponder is used for PD localization in cases of long cables > 3 km (1.8 miles). It injects the pulse back after

receiving the actual PD signal in order to make comparison simpler for the system

PD analysissystem (installedin Laptop)

Transponder

Accessories kit


Software overview Case studies / examplesData storage All information about the test as well as acquisition and analysed results are saved in a database so that personnel

using the system can retrieve the data later on when required without fear of losing test files. Data can be easily exported and imported

Self testing Self testing of the system can be performed to ensure the proper working of internal circuitry

Offline calibration Representing the values in picocoulombs (pC) requires the calibrated HFCTs or offline calibration. The later is the

most accurate. Software provides facility to perform offline pC calibration in order to show the magnitude of HFCT accurately in pC

Return time measurement In order to locate PD along the length of cable accurately, return time measurement of the pulse along the length of

the cable is important. The software enables the user to record return time of pulse along with the help of a transponder

Denoising The software performs noise rejection and filtering automatically if activated. Recorded data is stored in the database

for further analysis by the Expert Analysis section

Expert Analysis The complete recorded data is analysed and all the activities are separated out as different categories. Each category

contains pulses of the same characteristics. Trend plots, maximum, average and pulse count phase resolved cumulative distributions, pulse shapes, localization pulse, PD localization mapping and 3D plots can be viewed for each category on each channel or as cumulative activity at each channel

Reporting Reports can be generated after Expert Analysis to include the following:

The measuring method The system is capable of detecting and locating partial discharge in all kind of HV/MV cables:

XLPE, EPR, PVC, PILC, etc. cable Single core and multi core cable Cables of any length or any number of joints

PD measurements are made using HFCT and TEV sensors that are clamped over the earth screen. HF Signals are captured synchronously enabling the test engineer to observe phase-related patterns of discharge, online and in real-time

The Expert analysis system provides an automatic PD detection and criticality level for the cable based on magnitude and number of PD pulses per power cycle. Qualitrol experts and the PD analysis system together are capable of differentiating PD activity from external noise and local discharges, e.g. corona, surface discharge, switchgear PD, etc

The “Time Domain Reflectometry” (TDR) algorithm is used to accurately locate the PD to an accuracy of less than 0.2% to 1% of the cable length

The Transponder is used at the other end of the cable section to keep the similar accuracy of localisation in the longer cable sections (greater than 3 km)



Extracted noise pulse

Test Information Plots for each channel Trend plot of each channel versus external sensor Maximum, average and pulse count phase resolved

distributions of each channel versus external sensor 3D plot of phase, magnitude and acquisition Index Plots for each category of each channel Trend plot

Maximum, average and pulse count phase resolved distributions of each channel versus external sensor

Pulse shape of category and simultaneous pulses on other channels

Localization pulse PD localization mapping 3D plot of phase, magnitude and acquisition index

Extracted noise pulse Extracted PD pulse Extracted PD pulse

Expert Analysis Expert Analysis

Self test Reporting

PD location pulse PD localization map

Software overview Case studies / examplesData storage All information about the test as well as acquisition and analysed results are saved in a database so that personnel

using the system can retrieve the data later on when required without fear of losing test files. Data can be easily exported and imported

Self testing Self testing of the system can be performed to ensure the proper working of internal circuitry

Offline calibration Representing the values in picocoulombs (pC) requires the calibrated HFCTs or offline calibration. The later is the

most accurate. Software provides facility to perform offline pC calibration in order to show the magnitude of HFCT accurately in pC

Return time measurement In order to locate PD along the length of cable accurately, return time measurement of the pulse along the length of

the cable is important. The software enables the user to record return time of pulse along with the help of a transponder

Denoising The software performs noise rejection and filtering automatically if activated. Recorded data is stored in the database

for further analysis by the Expert Analysis section

Expert Analysis The complete recorded data is analysed and all the activities are separated out as different categories. Each category

contains pulses of the same characteristics. Trend plots, maximum, average and pulse count phase resolved cumulative distributions, pulse shapes, localization pulse, PD localization mapping and 3D plots can be viewed for each category on each channel or as cumulative activity at each channel

Reporting Reports can be generated after Expert Analysis to include the following:

The measuring method The system is capable of detecting and locating partial discharge in all kind of HV/MV cables:

XLPE, EPR, PVC, PILC, etc. cable Single core and multi core cable Cables of any length or any number of joints

PD measurements are made using HFCT and TEV sensors that are clamped over the earth screen. HF Signals are captured synchronously enabling the test engineer to observe phase-related patterns of discharge, online and in real-time

The Expert analysis system provides an automatic PD detection and criticality level for the cable based on magnitude and number of PD pulses per power cycle. Qualitrol experts and the PD analysis system together are capable of differentiating PD activity from external noise and local discharges, e.g. corona, surface discharge, switchgear PD, etc

The “Time Domain Reflectometry” (TDR) algorithm is used to accurately locate the PD to an accuracy of less than 0.2% to 1% of the cable length

The Transponder is used at the other end of the cable section to keep the similar accuracy of localisation in the longer cable sections (greater than 3 km)



Extracted noise pulse

Test Information Plots for each channel Trend plot of each channel versus external sensor Maximum, average and pulse count phase resolved

distributions of each channel versus external sensor 3D plot of phase, magnitude and acquisition Index Plots for each category of each channel Trend plot

Maximum, average and pulse count phase resolved distributions of each channel versus external sensor

Pulse shape of category and simultaneous pulses on other channels

Localization pulse PD localization mapping 3D plot of phase, magnitude and acquisition index

Extracted noise pulse Extracted PD pulse Extracted PD pulse

Expert Analysis Expert Analysis

Self test Reporting

PD location pulse PD localization map


System components


TECHNICAL SPECIFICATIONS

Supply power

Voltage rangeC-PDP system

Input

90 to 264 V AC; 47 to 63 Hz

70 W

4 channels (can take output from HFCT, TEV, noise antenna)

> 90V

125 MS/s

1 Channel (captured PD pulse >10 mV from HFCT)

2 outputs: 1 - HV pulse 180 V (out into HFCT). 2 - trigger pulse 5 V

Free running mode and trigger mode

Rechargeable battery, runs for 8 hours

Clamped around cable earth

Coaxial analog output (BNC type)

200 kHz - 15 MHz

up to 10 mV/mA

Magnetically attached to metal clad


1 MHz - 50 MHZ

Up to 100 mV/V

100 - 3000 MHZ

Ability to monitor and record PD during testing

-25° to +55° C [-13° to +131° F]

-25° to +85° C [-13° to +185° F]

5 - 95% non-condensing

IP66 when closed

IEEE C37.98 (Seismic Testing of Relays)

BS EN 60068-2-2BS EN 60068-2-1BS EN 60068-2-78

BS EN 68-2-6BS EN 68-2-27BS EN 68-2-29

Confirms to relevant specifications for monitoring / control equipment in HV substations.

EMI / RFI immunity

Calibration can be supplied to perform offline pC calibration

External sync unit can be used to synchronize the system to external trigger

800 mm x 600 mm x 350 mm [31.5” x 23.6” x 13.8”]

Main unit:15 kg [33 lbs]Accessory box:16 kg [35.3 lbs]

Surge protection

Sampling rate

Transponder Input

Output

Modes of operation

Power

Mounting

Output

Bandwidth

Sensitivity

HFCT sensors

Mounting

Output

Bandwidth

Sensitivity

TEV sensors

RF antennaNoise sensor

HV testing Compatible

Environmental Ambient operating temperature

Calibrator

Weight

Storage temperature

Humidity

Enclosure rating

Seismic

Environmental test compliance

Vibration test compliance

Immunity EMC test compliance

Others

Optional

Sync unit

DimensionsMechanical

System

Quantity

4 channel portable system(Integrated with hardware filters,protection, acquisition, power supply and synchronization)

1

Item

HFCT (set of 2)

Coaxial cables

1

2

Options

Quantity

pC calibrator

Transponder (needed when cablelengths are greater than 5 km)

1

1

Item

Accessories

Quantity

10m coaxial cables

Power cable

Earth cable

High Frequency CurrentTransformers

Noise antenna

Laptop, with installed software

Accessory case

4

1

1

3

1

1

1

Item

Outline Of QCM-C-PDP System Components

Long length of power cable

USB link to laptopto acquire data, analyze

and generate reports

ACsupply

EarthOther 2HFCTs

Transponder receives smallPD pulses from one HFCT

and injects a high magnitudepulse back into the cable

HFCT sensorto detect cable

internal discharges

TEV sensorto detect external

discharges



TECHNICAL SPECIFICATIONS

Supply power

Voltage rangeC-PDP system

Input

90 to 264 V AC; 47 to 63 Hz

70 W

4 channels (can take output from HFCT, TEV, noise antenna)

> 90V

125 MS/s

1 Channel (captured PD pulse >10 mV from HFCT)

2 outputs: 1 - HV pulse 180 V (out into HFCT). 2 - trigger pulse 5 V

Free running mode and trigger mode

Rechargeable battery, runs for 8 hours

Clamped around cable earth


200 kHz - 15 MHz

up to 10 mV/mA

Magnetically attached to metal clad


1 MHz - 50 MHZ

Up to 100 mV/V

100 - 3000 MHZ

Ability to monitor and record PD during testing

Calibration can be supplied to perform offline pC calibration

External sync unit can be used to synchronize the system to external trigger

800 mm x 600 mm x 350 mm [31.5” x 23.6” x 13.8”]

Main unit:15 kg [33 lbs]Accessory box:16 kg [35.3 lbs]

Surge protection

Sampling rate

Transponder Input

Output

Modes of operation

Power

Mounting

Output

Bandwidth

Sensitivity

HFCT sensors

Mounting

Output

Bandwidth

Sensitivity

TEV sensors

RF antennaNoise sensor

HV testing Compatible

Calibrator

Weight

Optional

Sync unit

DimensionsMechanical

® ®©2013 QUALITROL Company LLC, an ISO 9001 system certified company. QUALITROL is a registered trademark and OTIWTI is a trademark of QUALITROL Company LLC. All trademarks are properties of their respective companies, as noted herein. All rights reserved. Information subject to change without notice. PD-D27-14L-02E.

Email: [email protected]


®About QUALITROL®Established in 1945, with continual improvement at the core of our business, QUALITROL provides smart utility asset

condition monitoring across the globe. We are the largest and most trusted global leader for partial discharge monitoring, ®asset protection equipment and information products across generation, transmission and distribution. At QUALITROL

we are redefining condition monitoring technology for Electric utilities assets.

Online PD measurement at power cables without disrupting plants / facilities - offline factory testing

Excellent interference immunity for PD measurement under difficult conditions

Highest level of reliability of PD inspection

Highly accurate fault location and PD severity analysis

Power cables are not exposed to higher voltage stresses

PD measurement and analysis with total confidence

Unbiased diagnosis and assessment of critical power cables

Expert consulting services during acceptance testing and maintenance planning are available

Overall insulation health assessment and extension of life time of power cable

Implementation of efficient condition based maintenance strategies

Ensuring reliable continued operation ofpower cables and termination boxes ofmetal clad switchgear, rotating machinesand transformers

Portable partial discharge monitor for cables

QCM-C-PDPQCM-C-PDP Portable partial discharge monitor for cables

Product SummaryProduct SummaryDescription The portable system can be QCM-C-PDP

used to measure partial discharges in power cables

and terminations boxes of metal clad switchgear,

rotating machines and transformers. PD can be

localized within 0.2% to 1% of the cable length. The

QCM-C-PDP can be applied to measure PD on-line on

cables and their termination boxes while the system is

energized. There is no need to de-energize the cables

if some requirements are met.

Application The QCM-C-PDP cable online PD

measurement system can be successfully used for

measuring partial discharge in cables with confidence.

Used for low-cost, high performance periodic online

and offline PD testing on HV insulating system of

power cables and their terminations in transmission

installations, power plants and large industrial

consumers. The information gained may be used for

condition based maintenance decisions



Accurate categorization of different activities captured by system


Advanced denoising and filtering help to remove background noise efficiently

Documents

QCM-C-PDP Portable partial discharge monitor for cables ......measuring partial discharge in cables with confidence. Used for low-cost, high performance periodic online and offline